night, we learned of that phone call, the former president george h.W. Bush, the oak ridge boys singing into the phone. Tonight we learn about the scramble after that request from barbara bush and the two words we heard at the other end of the line when the band finished. Here's clayton sandell now. ♪ Amazing grace max ♪ Reporter: It was a spirit lifting serenade for the former commander in chief ordered up by former first lady barbara bush. She called us and said we should cheer the president up. And if the oak ridge boys could all get together and sing him a song or two. Reporter: The bush family and ridge boys have been mutual fans for decades. When the call from mrs. Bush came in, the boys were on vacation but dropped everything gathering at the office in only 45 minutes. It was actually great to hear the president's voice in a cheerful mood. Reporter: Mr. Bush, 88-years-old, is in this houston hospital fighting complications of bronchitis. An expected three-day stay now stretching more than a month. But when the band called his room on friday, number 41 had a request. He said he was ready to hear some of elvira. ♪ Elvira ♪ that would make him feel good. Reporter: The boys picked one of their favorites. You'll remember this one. ♪ Amazing grace ♪ ♪ how sweet the sound ♪ that saved a retch like me ♪ ♪ I once was lost ♪ ♪ but now I'm found ♪ was blind but now I see ♪ there you go. The day after that mini concert, mr. Bush was moved out of the intensive care unit here. But still no word on when he may be allowed to go home.

This transcript has been automatically generated and may not be 100% accurate.

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